import java.util.Scanner;
public class a3{
    private static boolean yes;

    public static <no> void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入本次购物价格");
        double h = scanner.nextDouble();
        System.out.println("亲，包邮吗？");
        String i = scanner.next();
        if (yes) {
            System.out.println(h);
        } else {
            System.out.println(h + 20);
        }
    }}
